Based on MySQL 5.5.24, including all the bug fixes in it, Percona Server 5.5.24-26.0 is now the current stable release in the 5.5 series. All of Percona‘s software is open-source and free, all the details of the release can be found in the 5.5.24-26.0 milestone at Launchpad.

A Server acting as a replication slave with the query cache enabled could crash with glibc detected memory corruption. This bug was introduced in MySQL 5.5.18 and Percona Server inherited it from MySQL. Bug fixed #915814 (George Ormond Lorch III).

Since the output file is simply overwritten when dumping the LRU list, we could end up with a partially written dump file in case of a crash, or when making a backup copy of it. Safer approach has been implemente. It now dumps to a temporary file first, and then rename it to the actual dump file. Bug fixed #686392 (George Ormond Lorch III).